Elbow-forming machine.



M. L. HUNKER.

ELBOW FORMING MACHINE.

APPLICATION FILED MAR. 4, 1916.

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M. L. HUN KER. EL'BOW FORMING MACHINE.

APPLICATION FILED MAR. 4, I9I6.

Patented Mar. 6,1917.

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M. 'L. HUNKER.

ELBOW FORMING MACHINE.

APPUCATION mzo MAR. 4, 1916.

Patented M21136, 1917.

5 SHEETS-SHEET 3 ATTORNEY 7 M. L. HUNKER.

ELBOW FORMINGVMACHINE.

APPLICATION FILED MAR. 4, I916- Patentd Mar, 6, 1917;

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ELBOW FORMlNG MACHINE.

APPLICATION FILED MAR. 4. l9l6.

Patented Mar. 6, 1917.

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MARTIN L. HUNKER, OF WHEELING, WEST VIRGINIA, A-SSIGNOR T0 WHEELING CORRU- GATING COMPANY, OF WHEELING, V] EST VIRGINIA, A CORPORATION OF WEST VIRGINIA.

ELBOW-FORMING MACHINE.

Specification of Letters Patent.

Patented Mar. 6, 1917.

To all whom it may concern:

Be it known that I, MARTIN L. HUNKER, a citizen of the United States ofAmerica, and resident of Wheeling, county of Ohio and State of West Virginia, have invented certain new and useful Improvements in Elbow- Forming Machines, of which the following is a specification.

This invention relates broadly to machines for forming sheet-metal elbows, and more particularly to an automatic machine for forming plaits in a tube or pipe whereby the latter is shaped to form an elbow. p

The primary object of my inventionis to provide an elbow forming machine which is automatic in its, operations and which possesses various marked advantages over the elbow machines commonly employed.

\Vith these and other objects in view, the invention resides in the features of construction, arrangement of parts and combinations of elements which will hereinafter be fully described, reference being had to the accompanying drawings, in which Figure 1 is a front end elevation of the j aw-actuating mechanism Fig. 2 is a side elevation of the invention,

parts being shown broken away to more clearly illustrate certain details of construction;

Fig. 3 is a view of the mandrel and certain associated parts, the same being shown partially in side elevation and partially in longitudinal section;

Fig. et is a partial transverse sectional view on the line 4-4:, Fig. 3;

Fig. 5 is a detail section on the line 5 5, Fio 4- Fig. 6 is an enlarged front end elevation of the parts shown in Fig. 3;

Fig. 7 is an enlarged longitudinal section of the front end of the mandrel and certain associated parts, the same being shown in he positions assumed'thereby at the conclu sion of the crimp-forming operation and.

just prior to the rearward fold forming movement of the foremost tube-embracing jaws;

Fig. 8 is a similar view showing the parts in the positions assumed prior to the return rotary movement of the mandrel-embraced sleeve Fig. 9 is a similar view showing the parts in the position assumed immediately subsequent to the return of the foremost jaw-sections from their fold-inclining movement;

Fig. 10 is a sectional view of the outer end of the tubular blank and the cap for maintaining the tubular form of the latter;

Fig. 11 is an enlarged front elevation of the rearmost tube-embracing jaws, showing details of the jaw-opening means;

Fig. 12 is a sectional view of the two pairs of tube el'nbracing jaws, the section being taken on line 1212, Fig. 11;

Fig. 13 is a detail view in front elevation of the segmental fold-flattening jaws;

Fig. 14 is a section on the line 14L-14, Fig. 2;

Fig. 15 is an elevation of the driving gears for the. main shaft;

Figs. 16 and 17 are detail sections taken respectively on lines 16-16 and 17-17, Fig. 2;

Fig. 18 is a detail perspective view of a portion of the jaw-opening mechanism shown in Figs. 11 and 12;

Fig. 19 is a detail view in top plan of the cam and associated parts employed for actuating the fold-flattening jaws;

Fig. 20 is a side elevation of the same;

Fig. 21 is a detail perspective view of the cam which actuates the mechanism employed for folding and inclining the walls of the crimps;

Fig. 22 is a section on the line m-m, Fig. 1; and j Fig. 23 is a side elevation of an elbow formed by means of my invention.

Referring to said drawings, in which like designating characters distinguish like parts throughout the several views 1 and 2 indicate generally the front and rear ends, respectively, of a suitable frame which supports the various mechanisms constituting the invention. Rigidly mounted upon the frame end 2 is'the rear end of a horizontal hollow mandrel 3 having an eccentrically disposed bore within which is disposed a rotatable sleeve 4 having a longitudinal bore 5 extending therethrough said bore being also disposed eccentrically for a purpose which will presently be made apparent. A shaft 6 is rotatably disposed Within said bore 5 with its rear end projected outward therefrom beyond the corresponding reduced end 4* of said sleeve 4 which latter projects outward from the mandrel and has fixed thereon a pinion 7. A like pinion 8 is fixed on the projecting end of the shaft 6. Said sleeve 4 and shaft 6 have their front ends flush with the front end of the mandrel 3, and projecting forward from the front end of said shaft is an integral wrist 9 having an eccentric disposition with respect to said shaft. The location of said wrist 9 is such that, while it is eccentrically disposed with respect to the shaft, it is concentrically disposed withv respect to the shaft-embracing sleeve 4 when the latter occupies its normal position.

The upper or body portion 1 of the front end of the supporting frame is )referably of substantially circular form, as shown in Fig. 1, and is concentric with the mandrel 3. A bracket 10 is mounted on each of two opposite sides of said body portion 1 at points lateral with respect to said mandrel, and each of said brackets has formed in its inner face at a point slightly below the level of the axial line of said mandrel a dove-tail groove or channel 11 which extends in a direction pa allel to said mandrel and which has slidably mounted therein a tongue 12 carried by, or formed integral with, an upright plate 13 which is disposed in loosely embracing relation to the mandrel at a point closely adjacent to the front end of the latter. Pivotally mounted at 14; on the front face of said plate 13 at a point below the level of the mandrel and in vertical alinement with the axis of the latter are two complemental jaw sections 15 which normally occupy closed mandrel-embracing positions, as shown in full lines in Fig. 11.

Located directly in front of and at a spaced distance from the jaw sections 15 are the precisely similar complemental sections 16 of a second jaw which is designed to cooperate with the first mentioned jaw, as will hereinafter be explained. Said jaw sections 16 are pivoted at their lower ends upon the face of a normally upright plate 17 which has lateral lugs or bearings 18 pivotally mounted upon inwardly extending bearing pins 19 seated in arms 1O carried by said brackets 10. Said plate 17 has a circular opening 20 which substantially alines horizontally with the opening in plate 13 to permit of the passage therethrough of the tube or elbow blank 21 which, seated upon the mandrel, is being acted upon.

Mounted upon the body of the mandrel S is a longitudinally slidable work-advancing or feeding sleeve 22 which has its front end provided with an internal annular recess or channel designed to receive the rear end of the blank 21 carried by said mandrel. Any suitable means may be employed for advancing said sleeve 22 by intermittent properly timed steps, the means herein de picted for illustrative purposes being but one of various mechanisms which might be employed. The same comprises a longitudinally extending toothed rack 24 carried by said sleeve 22 and a gear wheel 25' in engagement with said rack, saidgear being slidably mounted upon a splined shaft 26 which is journaled in supporting arms 27 which are carried by any appropriate portion of the frame, as the rear end member 2. Intermittent rotation is communicated to said shaft 26 from a rotating shaft 28 through a series of elements which includes a cam 29 fixed on said shaft 28, a pivoted lever 30 having its free end in engagement with said cam so as to be temporarily elc vated by the latter at a definite point in the rotation of said shaft 28, a rod 31 pivoted at its lower end to said lever 30 intermediate the ends of the latter, a lever of hell crank form, a spring pressed pawl 33 carried by said lever 32, and a ratchet wheel 34: fixed upon said shaft 26 and having spaced teeth thereon operatively engaged by said pawl. Said lever 32 has one arm pivoted on the shaft 26 and has its other arm pivotally connected to the upper end of said rod 31. It will thus be understood that the work-advancing sleeve is moved forward a definite distance through the intermediate mechanism described at each complete revolution of the continuously rotating shaft 28, said distance being that which is desired between 4 adjacent plaits or folds to be formed in the work.

Rotatably mounted upon and concentric with the wrist 9 of shaft 6 is a disk having a beveled peripheral edge, said disk being designed to swing throughout an eccentric path with the travel of said wrist for forming in the blank 21 outwardlypressed annular V-shaped crimps 36 which are later thrown back upon the body of said blank in the form of plaits 37. Said disk occupies a position close to the forward ends of the mandrel 3, sleeve 1 and shaft (3. Keyed upon said wrist 9 close in front of said disk is a relatively smaller circular wheel or disk 38, the same being disposed eccentrically on said wrist, as is most clearly shown in Fig. 7; and freely rotatable upon the periphery of said disk 38 is a ring 39, the same being disposed eccentrically with respect to said disk 38 and concentric with respect to disk 35. Said ring follows the eccentric movement of the disk 35 as the latter is thrust outward for forming the crimps in the blank 21 and is designed to engage the inner surface of said blank adjacent to the portion of the latter which is being acted upon by said disk, and thus to cooperate with the blank-embracing jaw sections 16 which receive the outer end of the same, preventing distortion or buckling thereof under the influence of the pressure exerted by said disk 35. The ring 39 being freely movable, at all times occupies a position wherein its heavier side is lowermost.

A main drive shaft 40 is journaled in an appropriate position adjacent to the rear end of the frame, the same being connected to a source of motive power (not shown), as by a belt 41. A pinion 42 fixed on said drive shaft meshes with and drives a gear wheel 43 located on the shaft 28, hereinbefore-mentioned, the latter being disposed in parallel alinement with the mandrel 3 and having its e'nds journaled in suitable bearings in the lower part of the frame of the machine, as shown in Fig. 2. fixed thereon a gear 44 disposed in mesh with a gear 45 carried by a sleeve or hub 46 which is rotatable on a fixed stub-shaft 47 which is mounted at a suitable point on the frame member 2. Also fixed upon said hub 46 are two gears 48 and 49 each of which is mutilated by the omission of teeth on a portion or portions of its periphery, as will hereinafter be explained. Said gear 49 is adapted to have its teeth carried into meshing relation to the pinion 8 of the shaft 6, and the gear 48 is in like manner adapted to have its teeth carried into meshing relation to the pinion 7 carried by the sleeve 4.

When a blank 21 has been properly mounted upon the mandrel 3 and the drive shaft 40 is set in motion, a partial rotation is first imparted through the intermediate.

gearing to the sleeve 4, the pinion 7 of the latter being engaged by the short toothed segment 48 of mutilated gear 48 which initially occupies the position shown in Fig. 14. Said segment 48 is of such length relative to the circumference of said pinion 7 that a one-half revolution only is imparted thereby to the sleeve 4, moving the latter from its normal position, shown in Fig. 7, to that shown in Fig. 8. This movement effects a lowering of the shaft 6 to a position wherein the lowermost portion of the periphery of the disk 35 carried by the wrist 9 thereof produces a small dent or V-shaped crimp in the lowermost part of the blank.

At the instant that rotary movement of said sleeve 4 ceases, due to the passage of the segment 48 from engagement with pinion 7, the toothed segment 49 of mutilated gear 49 engages the pinion 8 of shaft 6, which gear initially occupies the position shown in Fig. 15. Said segment 49 is of a length equal to the circumference of said pinion 8, and, consequently, a single complete revolution is communicated to the shaft 6, which movement, due, to the eccentric disposition of the wrist 9, causes the disk to traverse an eccentric path relative to the mandrel 3, wherein its beveled periphery projects outward beyond the periphery of said mandrel,

Said shaft 28 also has producing the outwardly pressed V-shaped crimp 36 which is most clearly depicted in Fig. 7, said crimp havingits greatest dimen sion at the uppermost part of the blank and thence gradually decreasing, or tapering, to the lowermost part, as shown.

Immediately upon the completion of the revolution of the shaft 6, above described, the pinion 7 is engaged by toothed segment 48 of gear 48 and is rotated throughout a half revolution wherein the sleeve 4 is returned to its initial position, whereupon, as is apparent, the various elements mentioned occupy the positions shown in Fig. 7.

Fixed upon the shaft 28 isa cam 50 which is circular in form except that a projecting nose 51 is formed at a point on its periphery, as shown in Fig. 17. A lever 52 has one end pivotally mounted upon the lower end of a depending bracket 53 which is mounted on the under side of a horizontal frame member or table 54 which is disposed above the level of said shaft 28. Said lever 52 is disposed in substantially horizontal underlying relation to said cam 50 and has a pivoted roller 55 mounted thereon intermediate its ends, said roller being disposed in engagement with the periphery of said cam. Pivotally connected to the opposite end of said lever 52 is the lower end of a substantially up right rod 56 which has its upper end pivoted to the rear end of an upwardly and rearwardly inclined crank arm 57 having its opposite end fixed on a transversely disposed shaft 58 which is j ournaled in bearings provided in the lower inner face portions of the opposite brackets 10. Each of a pair of crank arms 59 having their lower ends fixed on said shaft 58 adjacent to the opposite ends of the latter are disposed at right angles to said crank arm 57 and have their upper ends pivotally connected to the horizontally movable plate 13 adjacent to the tongues 12 of the latter. As will readily be understood, the plate 13 occupies its advanced position, as shown in Fig. 2, throughout the major part of the revolution of shaft 28; and when the roller 55 carried by lever 52 is engaged by the nose 51 of cam 50, said lever is swung downward, actuating said plate, through the intermediate mechanism, to move rearward, the tongues 12 thereof sliding in the channels 11 of brackets 10. I

Immediately following the blank crimp ing operation and just prior to the commencement of the retracting movement of the plate 13, as hereinbefore described, the plate 17 carrying the pivoted jaw sections 16 is swung inward on its pivotal mountings 19, causing said jaw sections to move from the full line position shown in Fig. 7 to the dotted line position shown in said figure, whereby the foremost side or wall of the crimp 36 is thrust rearward upon the rear side or wall thereof. Formedv on the rear face of each of said jaw sections 16 at a suitable distance outward with respect to the pipe engaging surface thereof and extend ing from one end of said section to the other is a rearwardly projecting rib 61 designed to engage the upstanding fold produced by closing the crimp walls upon each other, as aforesaid, and to push said fold back to the inclined dotted line position thereof shown in Fig. 7 wherein said fold overlies a beveled forwardly projecting blank-embracing rib 62 formed on the front face of the aw constituted by the pivoted jaw sections 15.

As hereinbefore indicated, the crimp 36 gradually diminishes in size from the uppermost point of the blank 21 to the lowermost point. At said lowermost point the said crimp is of such small size as to be practically negligible, or if desired the crimp may be made to terminate at each side slightly above the lowermost point in the blank. Consequently, in either case, the very slight rearward rocking movement of the lower part of the foremost aw sections permitted by the nearness of the axis of the plate mountings 19 to the level of the under side of the blank 21 is sufficient.

The mechanism actuating the rearward rocking movement of the plate 17 in the manner aforesaid comprises a depending arm 63 carried by or formed integral with said plate, said arm having pivotally connected to its lower end the forward end of an inclined rod 6% which has its opposite end pivotally connected to the lower end of a lever 65. Said lever 65 is pivoted intermediate its ends upon a suitably supported bracket 66 and has an anti-friction roller 67 mounted in its upper end disposedin engagement with the rear face of a disk 68 which is fixed upon the shaft 28 and which has an outwardly extending cam-like projection 69 on its said rear face, as is most clearly shown in Fig. 21, said projection being located in the path of travel of said roller 67 so that at each rotation of said shaft 28 the lever 65 is swung from the full line position thereof shown in Fig. 2 to the dotted line position shown in said figure. As is obvious, the weight of the parts the posed between the lever 65 and the plate 17 is such that the latter is caused to return to its normal position after actuation.

Immediately following the return of the plate 17 to its normal position, as aforesaid, the plate 13 is retracted in the manner hereinbefore described to the position indicated in dotted lines in Fig. 9. Then, while said plates occupy said positions, a plurality of segmental jaws 70 are moved radially between the aws 15 and 16 for flattening upon the body of the blank 21 the inclined fold previously produced, as aforesaid, by the rearward swinging movement of said plate r 17. Said jaws 70 are carried upon the ends of radially disposed arms 71 which are slidable in radially extending guides 72 carried by the circular frame member 1*. Pivotally connected to the outer end of each arm 71 is the inner end of a link 73 which has its outer end pivoted to the inner end of a similar link 7a having its outer end pivoted to the frame member 1 adjacent to the outer or peripheral edge of the latter, said links constituting a toggle. The outer or front face of said frame member has a circular channel 75 formed therein in which is fitted, so as to have a limited rotary movement, a circular ring 76. Having one end pivotally attached to the knuckle of the tog gle is a link 77 which has its opposite end pivoted to the outer face of said ring 76. Said ring has fixed thereon at a suitable point an outwardly extending arm 78 to the .end of which is pivotally connected the upper end of an inclined rod or pitman 79. Said pitman has a slot 80 formed therein adjacent to its lower end, and received in said slot is the front end of the shaft 28., as is clearly shown in Figs. 19 and 20. Fixed in the extreme lower end of said pitman is one end of a laterally directed pivot pin 81 carrying thereon a roller 82 which is disposed in engagement with the periphery of a cam 83 fixed 0n the shaft 28. Thus, as is apparent, the pitman is drawn downward at a pointin the rotation of said shaf 28, imparting to the ring 76 a slight forward rotary movement which carries the links and toggles above mentioned from the full line positions shown in Fig. 1 to the dotted line positions shown in said figure, actuating the radially movable arms 71 carrying the segmental jaws 7 O to move inward to cause the latter to strike upon the then inclined folds of the blank 21 and to flatten said folds upon said blank to form the plaits, as shown in Fig. 23. The return movement of the segmental plait-flattening jaws 70 after actuation may be promptly effected by any appropriate means, as by a spring or weight (not show-n) connected to the arm 78; and immediately following said return movement both of the sectional jaws 15 and 16 are opened up to permit the plaits formed in the blank to unobstructedly pass therethrough as the latter is advanced to a position for having another plait formed therein.

The sections of said jaws 15 and 16 are opened simultaneously by a mechanism which includes a cam 8 1 fixed on shaft 28, said cam being circular in form except that a curved recess 85 is provided at a point on its periphery, as shown in Fig. 16. A lever 86 has one end pivotally mounted on a bracket 87 carried on. the under side of the table 5 1 and has its opposite end pivoted to the lower end of an upright rod 88. An anti-friction roller 89 carried by said lever 86 is disposed in engagement with said cam 8 1 and is adapted in each rotation of the latter to drop into the recess thereof to permit the free end of said lever 86 and the rod 88 to elevate slightly, actuated by a spring 110 interposed between the lever 86 and the table 54L, as shown in Fig. 16. Said rod is pivoted at its upper end to the rear end of a crank-arm 90 which is fixed upon a transverse shaft 91 having its ends loosely mounted in brackets 92 carried by the frame member 1*. Also fixed to said shaft is a pair of forwardly extending arms 93 having balls 94 formed on their front ends. Said arms extend through vertically disposed slots 95 provided therefor in the plate 13 and the ball 94: of each is received in a socket 96 formed in the coinciding faces of a pair of bearing blocks 97 which are held in fixed relation by an embracing clamp 98. Said bearing blocks are disposed midway between the plates 13 and 17. One of the blocks of each pair has fixed upon its upper face the lower end of an upwardly and rearwardly inclined arm 99 which carries upon its up-' per end a socket bearing block 100 in which is swiveled a ball lOl carried by a laterally disposed arm 102 which is fixed to the outer or lateral edge of the adjacent jaw section 15. The companion block of each pair in like manner carries an upwardly and forwardly inclined arm 103 which bears upon its upper end a socketed bearing block 106 in which is swiveled a ball 10% carried by a laterally disposed arm which is fixed to the adjacent jaw section 16. It will thus be apparent that, when the rod 88 is elevated, as hereinbefore described, a slight rotary movement is imparted to the shaft 91 carrying the arms 93 and the latter are thereby swung downward, moving in the slots 95. The bearing blocks 97 are thus lowered, and, through the arms 99 and 103, actuate the pivoted jaw sections 15 and 16 to swing outward to the dotted line positions shown in Fig. 11.

The blank 21 to be formed into an elbow is preferably disposed about the mandrel in blank, or unseamed sheet, form. The curled or curved form of the blank is maintained during the plait forming operation, it having its rear end seated in the internal annular channel 23 provided in the front end of the blank-advancing sleeve 22. The front end of said blank is received within a circular kerf or seat 108 provided in the inner face of a cap 107 which is mounted on said front end for maintaining the tubular form of said end, as shown in Fig. 10.

As will be understood, all of the various operations hereinbefore described requisite in the formation of a completed plait in the blank are performed during a single revolution of the main shaft 28. The various cams carried by said shaft are so disposed that the various mechamsms by which said op erations are successively performed are actuated in properly timed sequence. It will also be understood that suitable means is provided whereby each of the various mechanisms is promptly retracted or returned to normal position after actuation, such means having been herein omitted from the drawings to avoid confusion.

What is claimed is 1. In an elbow-forming machine, a mandrel, means for holding a blank on said mandrel, an eccentrically carried crimping disk located interiorly of the blank in front of said mandrel and adapted for eccentric movement with respect to the latter, rotatable means for imparting said movement, means for folding the sides of the crimp one on the other and for inclining the fold rearwardly, and means for flattening the fold upon the .body of the blank.

2. In an elbow forming'machine, an eccentrically bored mandrel, an eccentrically bored sleeve rotatable within said mandrel, a shaft rotatable within said sleeve, an eccentrically disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable on said wrist, means for imparting rotary movement to said sleeve, means for imparting rotary movement to said shaft, means for closing the sides of a crimp to form a fold and for inclining said fold rearwardly, and means for flattening said fold upon the body of the blank.

8. In an elbow forming machine, an eccentrically bored mandrel, an eccentrically bored sleeve rotatable within said mandrel, a shaft rotatable within said sleeve, an eccentrically disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable on said wrist, means for imparting rotary movement to said sleeve, means for imparting rotary movement to said shaft, shiftable aws embracing said blank at opposite sides of the crimp, means for shifting the foremost jaw rearward for closing the sides of a crimp to form a fold and for inclining said fold rearward, means for shifting'the rearmost jaw rearward, and means for flattening the inclined fold upon the body of the blank.

4. In an elbow forming machine, an eccentrically bored mandrel, an eccentrically bored sleeve rotatable within said mandrel, a shaft rotatable within said sleeve, an eccentrically disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable on said wrist, means for imparting rotary movement to said sleeve, means for imparting rotary movement to said shaft, shiftable jaws embracing saidv blank at opposite sides of the crimp, means for shifting the foremost jaw rearward for closing the sides of a crimp to form a fold, said foremost jaw carrying means whereby said fold is pushed back to a rearwardly inclined r sition, means for shifting the rearmost jaw rearward, and means for flattening the inclined fold upon the body of the blank.

5. In an elbow forming machine, an eccentrically bored mandrel, an eccentrically bored sleeve rotatable within said mandrel, a shaft rotatable within said sleeve, an eccentrically disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable on said wrist, means for imparting rotary movement to said sleeve, means for imparting rotary movement to said shaft, shiftable jaws embracing said blank at opposite sides of the crimp, means for shifting the foremost jaw rearward for closing the sides of acrimp to form afo-ld, said foremost jaw having a rib formed on its rear face for engaging and shifting said fold to an inclined position, and means for fiattening the inclined fold upon the body of the blank.

6. In an elbow forming machine, an eccentrieally bored mandrel, an eccentrically bored sleeve rotatable within said mandrel, a shaft rotatable within said sleeve, an eccentrically disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable on said wrist, means for imparting rotary movement to said sleeve, means for imparting rotary movement to said shaft, shiftable jaws embracing said blank at opposite sides of the crimp, means for shifting the foremost jaw rearward for closing the sides of a crimp to form a fold, said foremost jaw having a rib formed on its rear face for engaging and shifting said fold to an inclined position, and reciprocable radially disposed segmental jaws whereby said inclined fold is flattened upon the body of the blank.

7 In an elbow forming machine, an eccentrically bored mandrel, an eccentrically bored sleeve rotatable within said mandrel, a shaft rotatable within. said sleeve, an cecentrically disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable on said wrist, means for successively and progressively imparting a halfrotation to said sleeve, a complete rotation to said shaft and another half rotation to said sleeve, whereby said disk is actuated to form a crimp in the blank, means for closing the sides of said crimp and for shifting the resultant fold to an inclined position, means for flattening said fold upon the body of the blank, and means f f advancing said blank.

8. In an elbow forming machine, an ec centrically bored mandrel, an eccentrically bored sleeve rotatable within said mandrel, a shaft rotatable within said sleeve, an eecentrically disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable 011 said wrist, means for successively and progressively imparting a half-rotation to said sleeve, a complete rotation to said shaft and another half rotation to said sleeve, whereby said disk is actuated to form a crimp in the blank, a pair of complemental jaw sections embracing the blank at each of the opposite sides of said disk, means for swinging the foremost jaw sections into cooperative relation to the rearmost jaw sections for closing the sides of the crimp to form a fold and for inclining said fold rearwardly, means for returning the foremost jaw sections to their normal position, means for retracting the real-most jaw sections, and means for flattening the inclined fold upon the body of the blank.

9. In an elbow forming machine, an eccentrically bored mandrel, an eccentrically bored sleeve rotatable within said mandrel, a shaft rotatable within said sleeve, an eccentrically disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable on said wrist, means for successively and progressively imparting a half rotation to said sleeve, a. complete rotation to said shaft and another half rotation to said sleeve, whereby said disk is actuated to form a crimp in the blank, a pair of complemental jaw sections embracing the blank at each of the opposite sides of said disk, means for swinging the foremost jaw sections into cooperative'relation to the rearmost jaw sections for closing the sides of the crimp to form a fold and for inclining said fold rearwardly, means for returning the foremost jaw sections to their normal position, means for retracting the real-most jaw sections, means for flattening the inclined fold upon the body of the blank, means for simultaneously spreading the jaw sections of each of said jaws, and means for advancing said blank.

10. In an elbow forming machine, an cccentrically bored mandrel, an cccentrically bored sleeve rotatablewithin said mandrel, ashaft rotatable within. said sleeve, an eccentrieally disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable. on said wrist, means for successively and progressively imparting a half rotation to said sleeve, a complete rotation to said shaft and another half rotation to said sleeve, whereby said disk is actuated to form a crimp in the blank, a ring cooperating with said disk interiorly of the blank for preventing distortion of the latter, means for closing the sides of said crimp and for shifting the resultant fold to an inclined position, and means for flattening said fold upon the body of the blank.

11. In an elbow forming machine, aneceentrically bored mandrel, an eccentricallv bored sleeve rotatable within said mandrel, a shaft rotatable within said sleeve, an cecentrically disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable on said wrist, means for successively and progressively imparting a half rotation to said sleeve, a complete rotation to said shaft and another half rotation to said sleeve, whereby said disk is actuated to form a crimp in the blank, a ring cooperating with said disk interiorly of the blank for preventing distortion of the latter, means for closing the sides of said crimp and for shifting the resultant fold to an inclined position, means for flattening said fold upon the body of the blank, and'means for inter mittently advancing the blank.

12. In an elbow forming machine, an eccentrically bored mandrel, an eccentrically bored sleeve rotatable within said mandrel,

a shaft rotatable within said sleeve, an eccentrically disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable on said wrist, means for successively and progressively imparting a half rotation to said sleeve, a complete rotation to said shaft and another half rotation to said sleeve, whereby said disk is actuated to form a crimp in the blank, a ring cooperating with said disk interiorly of the blank for preventing distortion of the latter, a sectional jaw embracing the blank at each side of the crimping disk, the foremost jaw being pivoted and adapted to'swing toward the rearmost jaw for closing the sides of the crimp and for inclining the resultant fold, means for retracting the rearmost jaw, and means for flattening the inclined fold upon the body of the blank.

13. In an elbow forming machine, an eccentrically bored mandrel, an eccentrically bored sleeve rotatable Within said mandrel, a shaft rotatable within said sleeve, an eccentrically disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable on said wrist, means for successively and progressively imparting a half rotation to said sleeve, a complete rotation to said shaft and another half rotation to said sleeve, whereby said disk is actuated to form a crimp in the blank, a ring cooperating with said disk interiorly of the blank for preventing distortion of the latter, a sectional jaw embracing the blank at each side of the crimping disk, the foremost jaw being pivoted and adapted to swing towardthe rearmost aw for closing the sides of the crimp and for inclining the resultant fold, means for retracting the rearmost jaw, means for simultaneously spreading the sections of both jaws, and means for advancing the blank while said sections occupy spread positions.

14. In an elbow forming machine, an eccentrically bored mandrel, an eccentrically bored sleeve rotatable within said mandrel, a shaft rotatable within said sleeve, an eccentrically disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable on said wrist, means for successively and progressively lmpartmg a half rotation to said sleeve, a complete rotation to said shaft and another half rotation to said sleeve, whereby said disk is actuated to form acrimp in the blank, a ring cooperating with said disk interiorly of the blank for preventing distortion of the latter, a sectional jaw embracing the blank at each side of the crimping disk, the foremost jaw being pivoted and adapted to swing toward the rearmost aw for closing the sides of the crimp to form an upright fold, said foremost jaw bored sleeve rotatable within said mandrel,

a shaft rotatable within said sleeve, an eccentrically disposed wrist formed on the free end of said shaft, a blank-crimping disk rotatable on said wrist, means for successively and progressively imparting a half rotation to said sleeve, a complete rotationto said shaft and another half rotation to said sleeve, whereby said disk is actuated to form a crimp in the blank, a ring cooperating with said disk interiorly of the blank for preventing distortion of the latter, a sectional jaw embracing the blank at each side of the crimping disk, the foremost jaw being pivoted and adapted to swing toward the rearmost jaw for closing the sides of the crimp to form an upright fold, the rearmost jaw having a beveled blank-engaging rib on its front face and the foremost jaw having a rib on its rear face at a distance from its inner blanlsembracing surface, the rib of the foremost jaw being designed to engage the fold and to incline the same over the rib of the rearmost jaw, means for retracting both of said jaws, and means for flattening the inclined fold upon the body of the blank.

16. An elbow-forming machine comprising a mandrel, means for holding a blank on said mandrel, a loosely mounted disk located interiorly of the blank in front of said mandrel, and rotatable means for actuating said disk to move throughout an eccentric path relative to said mandrel for producing a crimp in said blank.

17. An elbow-forming machine comprising a mandrel, means for holding a blank on said mandrel, a disk located interiorly of the blank in front of said mandrel, and rotatable means for actuating said disk to move ing a mandrel, means for holding a blank on said mandrel, a disk located interior-1y of the blank in front of said mandrel, rotatable means for actuating said disk to move through an eccentric path relative to said mandrel for producing in said blank a crimp Whose dimensions vary throughout, means for closing the sides of the crimp together to form a fold, and means for flattening the fold upon the body of the blank.

19. In an elbow-forming machine, a mandrel adapted for receiving a pipe blank thereon, a crimping disk located interiorly of the blank in front of said mandrel, and means for actuating said disk to travel throughout an eccentric path with respect to said blank, said disk being adapted for rolling planetary-like movement with respect to said blank during said travel.

20. An elbow-forming machine comprising a mandrel, means for holding a blank on said mandrel, a disk located interiorly of the blank in front of said mandrel, and means for actuating said disk to travel throughout an eccentric path relative to said mandrel for producing a crimp in said blank, said disk being adapted for rolling planetary-like movement during its travel.

21. In an elbow-forming machine, a man drel, means for holding a blank on said man.- drel, an eccentrically carried crimping disk located interior-1y of the blank in front of said mandrel and adapted for rolling planetary-like movement with respect to the latter.

In testimony whereof, I allix my signature in presence of two subscribing witnesses.

MARTIN L. lIUNKElt. lVitnesses H. E. DUNLAP, W. F. Knnrnn.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

